Advertisements
Advertisements
प्रश्न
Find the odd one out and give its explanation.
विकल्प
Zinc coating
Tinning
Electroplating
Calcination
Advertisements
उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
APPEARS IN
संबंधित प्रश्न
Write the composition of the alloy called bronze.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Aluminum is used in thermite welding:
write reaction for process?
What is meant by refining of metals? Name the three common methods used for refining.
Which method of refining is used to get 99.8% pure aluminium?
Answer the following question :
What is the difference between calcination and roasting.
Define calcination.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
Electrical wires have a coating of an insulting material. The material, generally used is
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
